I ran the command: sudo netplan apply and got the

following output:

"warp

(generate:10699): WARNING: 18:37:17.317: gateway4

has been deprecated, use default routes instead.

See the 'Default routes' section of the documentation for

more details.

/etc/netplan/50-cloud-init.yaml: 19:25: Error in network

definition: expected mapping (check indentation)

nameservers:

How do I fix this?